Sorry, didn't exactly make that clear in the config. Yep, you only get one per craft now, purely to make fusion reactors more expensive. I felt they were a tad cheap for the amount of energy they can potentially produce (hundreds of kRF/t).

No, don't worry - basically, I'm accidentally registering the CraftTweaker support twice, but I guess it just wasn't being reported by CraftTweaker before, and now it is. It won't crash the game but that message is a little annoying.

java.lang.NullPointerException: Ticking block entity at nc.tile.dummy.TileFissionPort.findCasing(TileFissionPort.java:40) at nc.tile.dummy.TileFissionPort.findMaster(TileFissionPort.java:65) at nc.tile.dummy.TileDummy.onAdded(TileDummy.java:79) at nc.tile.dummy.TileFissionPort.onAdded(TileFissionPort.java:33) at nc.tile.NCTile.func_73660_a(NCTile.java:27) at nc.tile.energy.TileEnergy.func_73660_a(TileEnergy.java:45) at nc.tile.dummy.TileDummy.func_73660_a(TileDummy.java:61) at nc.tile.dummy.TileFissionPort.func_73660_a(TileFissionPort.java:24) at net.minecraft.world.World.func_72939_s(World.java:1829)